ivory
noun uk/ˈaɪ.vər.i/ us/ˈaɪ.vɚ.i/
(SUBSTANCE)
[ U ]象牙
the hard yellowish-white substance that forms the tusks of some animals such as elephants, used especially in the past to make decorative objects
Ivory is a softer material than you might imagine.
a ban on ivory trading 象牙交易禁令
[ C usually plural ]象牙制品
an object made from ivory
a collection of Japanese ivories 日本象牙制品藏品
Idiom
tickle the ivoriesidiom old-fashioned humorous 弹钢琴
to play the piano
He's the piano teacher who taught my daughter to tickle the ivories.